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authorReshetova, Elena <elena.reshetova@intel.com>2017-07-04 15:53:01 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-05 00:35:16 +0300
commit458bc30cec26c2716746ae215ed23773257e417d (patch)
tree692d00b3c0b0af34c20fdfe31b7a9cf6fa33e3be /include
parente0542dd5185e68247b08c3418bdba14644b4c414 (diff)
downloadlinux-458bc30cec26c2716746ae215ed23773257e417d.tar.xz
net, atm: convert atm_dev.refcnt from atomic_t to refcount_t
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/atmdev.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/atmdev.h b/include/linux/atmdev.h
index 4d97a89da066..0ec9bdb1cc9f 100644
--- a/include/linux/atmdev.h
+++ b/include/linux/atmdev.h
@@ -11,6 +11,7 @@
#include <linux/uio.h>
#include <net/sock.h>
#include <linux/atomic.h>
+#include <linux/refcount.h>
#include <uapi/linux/atmdev.h>
#ifdef CONFIG_PROC_FS
@@ -158,7 +159,7 @@ struct atm_dev {
struct k_atm_dev_stats stats; /* statistics */
char signal; /* signal status (ATM_PHY_SIG_*) */
int link_rate; /* link rate (default: OC3) */
- atomic_t refcnt; /* reference count */
+ refcount_t refcnt; /* reference count */
spinlock_t lock; /* protect internal members */
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *proc_entry; /* proc entry */
@@ -261,13 +262,13 @@ static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size)
static inline void atm_dev_hold(struct atm_dev *dev)
{
- atomic_inc(&dev->refcnt);
+ refcount_inc(&dev->refcnt);
}
static inline void atm_dev_put(struct atm_dev *dev)
{
- if (atomic_dec_and_test(&dev->refcnt)) {
+ if (refcount_dec_and_test(&dev->refcnt)) {
BUG_ON(!test_bit(ATM_DF_REMOVED, &dev->flags));
if (dev->ops->dev_close)
dev->ops->dev_close(dev);